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Solid-phase sintering technique for manufacturing bismuth titanate orientation ceramic

A technology of solid-phase sintering and process method, which is applied in the preparation of piezoelectric ceramics and the field of ferroelectricity, can solve the problems of unfavorable large-scale production, incompatibility of production technology, and easy generation of secondary equivalence, and achieve environmental coordination and piezoelectricity. The effect of good performance and easy acquisition of materials

Inactive Publication Date: 2008-07-16
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to relevant literature and patent reports: the commonly used methods for preparing oriented ceramics have problems such as easy formation of secondary phases, incompatibility with current ceramic production processes, or complex processes that are not conducive to large-scale production.

Method used

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  • Solid-phase sintering technique for manufacturing bismuth titanate orientation ceramic
  • Solid-phase sintering technique for manufacturing bismuth titanate orientation ceramic

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation process and condition that embodiment adopts:

[0019] (1) Preparation of sample raw materials:

[0020] Analytical pure bismuth oxide (Bi 2 o 3 ) and spectroscopically pure titanium oxide (TiO 2 ), the raw materials were all products from Shanghai Chemical Reagent Co., Ltd., and the raw materials were baked in an oven at 110° C. for 8 hours before weighing.

[0021] (2) Weighing of raw materials:

[0022] Weigh the analytically pure bismuth oxide (Bi) with a purity of 99% by stoichiometric ratio 2 o 3 ) 0.2471kg and spectroscopically pure titanium oxide (TiO 2 )0.069671kg, of which bismuth oxide (Bi 2 o 3 ) Excess 15% is used to supplement the volatilization of bismuth oxide in the preparation process.

[0023] (3) Ball milling and pre-synthesis:

[0024] The weighed bismuth oxide and titanium oxide are mixed with absolute ethanol as the medium, mixed by ball milling for 24 hours, dried, put into an alumina crucible, and pressed lightly. At a...

Embodiment 1

[0034] The calculation results of the c-orientation ratio of the sample cut perpendicular to the axis of the cylinder under different sintering time conditions:

[0035] sintering

time

(Small

Time)

2

4

6

8

10

12

14

16

18

20

c take

Direction rate

(I c

%)

81.7

82.1

82.5

83.9

85.3

87.2

89.8

89.7

83.6

80.8

[0036] Note: Calculation of c orientation rate:

[0037] The c-orientation rate of the sample (I c ) according to the XRD measurement result by the formula:

[0038] I c =[∑I(00k)] / [∑I(hlk)]×100% (1)

[0039] Calculated, where I(00k) is the r...

Embodiment 2

[0041] Measurement results of ferroelectric and piezoelectric properties of samples cut parallel to and perpendicular to the cylinder axis with different orientation ratios

[0042]

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Abstract

The invention relates to a method of solid state sintering for preparing bismuth titanate orientation ceramic, which is characterized in that analytical pure bismuth oxide (Bi2O3) and spectrum pure titanium oxide (TiO2) are taken as materials; the weight percentage of the analytical pure bismuth oxide (Bi2O3) is 72 to 84 percent, and the weight percentage of the spectrum pure titanium oxide (TiO2) is 18 to 26 percent; after fully ball-milled and mixed, the material is filled inside an alumina crucible; pre-synthesizing is carried out for three times under 760 DEG C to 800 DEG C, and the heat preservation time of per-synthesizing for each time is 8 to 24 hours; the per-synthesized powers are added with adhesive and then shaped, discharged and sintered for 2 to 20 hours under 1,140 DEG C, thus obtaining the bismuth titanate orientation ceramic. The method of solid state sintering is simple in process and good in material availability; the solid state sintering in the prior art is adopted and oxide purchased in the market is used as material; the obtained material has good ferroelectric and piezoelectric performance.

Description

technical field [0001] The invention relates to a preparation method of ferroelectric and piezoelectric ceramics which can be used in new lead-free storage devices, sensors and transducers. Background technique [0002] Bismuth-based layered perovskite structure materials have been artificially synthesized for the first time in the late 1940s and found to have good ferroelectric and piezoelectric properties, and have been widely valued by people. In recent years, in order to develop new types of non-polluting electronic components such as memories, sensors, and transducers, bismuth-based layered perovskite structure materials are recognized as replacing PZT, thereby reducing lead-based ceramics in the production, use, and post-disposal processes. Among them, it is one of the candidate materials that cause serious harm to humans and the ecological environment. [0003] At present, the main methods to improve the performance of bismuth-based layered perovskite structure mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/46C04B35/64
Inventor 毛翔宇陈小兵王伟
Owner YANGZHOU UNIV
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